Question

What are Service Oriented Design Principles?

Answer 1

1. There are four Service-oriented principles (tenets) in SOA as given below :

   1. Boundaries are explicit: This SOA principle states that a service can be deployed anywhere and be easily and freely accessed by other services, regardless of the environment or development language of the other services.

   2. Services are autonomous: This SOA principle states that each service must be managed and versioned differently so that they do not affect other services in the process. Contracts, once published, should not be changed. Services need to be isolated and decoupled to accomplish the goal of making them autonomous.

   3. Services share schema and contract, not class: This SOA principle states that services should not pass classes and types; they pass schemas (data) and contracts (behaviors). This allows for a loosely coupled system where the service does not care what type of environment the other service is executing on. The information being passed is 100% platform independent.

   4. Service compatibility is determined based on policy: This SOA principle states that each service should have its own compatibility level and knows how it would interact with other services. Services look at each other’s policy, looking for similarities so that they can start communicating. If two services can’t satisfy each other’s policy requirements, they are not compatible with each other.